Try it Yourself: SQL Constraints – Hyring Learn

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SQL Constraints

Language: SQL

CREATE TABLE Customers (
    CustomerID   INT NOT NULL,
    FirstName    VARCHAR(50) NOT NULL,
    LastName     VARCHAR(50) NOT NULL,
    PhoneNumber  VARCHAR(20)
);

CREATE TABLE Customers (
    CustomerID   INT NOT NULL,
    FirstName    VARCHAR(50) NOT NULL,
    LastName     VARCHAR(50) NOT NULL,
    PhoneNumber  VARCHAR(20)
);

Output

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